AU2018323528A1 - Indene derivatives and uses thereof - Google Patents

Indene derivatives and uses thereof Download PDF

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AU2018323528A1
AU2018323528A1 AU2018323528A AU2018323528A AU2018323528A1 AU 2018323528 A1 AU2018323528 A1 AU 2018323528A1 AU 2018323528 A AU2018323528 A AU 2018323528A AU 2018323528 A AU2018323528 A AU 2018323528A AU 2018323528 A1 AU2018323528 A1 AU 2018323528A1
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compound according
pharmaceutically acceptable
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effective amount
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Haiyan Bian
Nathan G. DOLLOFF
Allen B. Reitz
Reeder M. ROBINSON
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Leukogene Therapeutics Inc
MUSC Foundation for Research Development
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MUSC Foundation for Research Development
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Abstract

The present invention relates to compounds of formula (I) :, including any stereochemically isomeric form thereof, or pharmaceutically acceptable salts thereof, for the treatment of, for example, cancer.

Description

INDENE DERIVATIVES AND USES THEREOF
FIELD OF THE INVENTION
The invention relates generally to indene derivatives useful for the treatment of cancers and for reducing resistance to standard of care cancer therapy. All documents cited to or relied upon below are expressly incorporated herein by reference.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
This invention was made with Government support under P20GM103542, ULITR001450, and R41CA213488. The Government has certain rights in the invention.
BACKGROUND OF THE INVENTION
Proteasome inhibitors (Pls) such as, for example, bortezomib, and histone deacetylase (HDAC) inhibitors such as, for example, panobinostat, are cornerstone agents in the treatment of multiple myeloma ( MM). Acquired or inherent resistance to these agents represents a significant obstacle to sustained and durable responses in patients, A need exists in the art for new, targeted strategies that target and kill MM and other cancer cell types, as well as enhance the activity of other therapies in resistant cancer cells.
SUMMARY OF THE INVENTION
The present invention is directed to a compound of formula (I):
Figure AU2018323528A1_D0001
(I),
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PCT/US2018/048449 wherein:
Rj and R?, independently of each other, are hydrogen, hydroxy L alkyl, alkoxy, methoxy-acetate, phosphate, valine, Gly-Ser, -OC(O)CH2OC(O)CH3, -OC(O)CH2OCH3, -OCH2C(O)C(CH3)3, OCH2C(O)NH2 or OCIl2C(O)OII; or Rj and R?, together with the carbon atoms to which they are attached, form a 5 to 6-membered ring with one or two ring carbons replaced independently by oxygen or nitrogen;
R.3 is hydrogen, hydroxyl, halogen, cyano, -COOII, -C(O)NH2, ~C(O)CH2CH3, -C(O)-alkoxy, alkyl, alkoxy, halo-lower alkyl, carboxyl, amide, ester or nitrile; and
R.i is alkyl or alkenyl, said alkyl or alkenyl optionally mono or bi-substituted independently with hydrogen, halogen, hydroxyl, -OCHj-phenyk cycloalkyl, -OCHs-halophenyl or OCH2phenylhaloalkyl, or a pharmaceutically acceptable salt thereof.
The present invention is also directed to a pharmaceutical composition, comprising a therapeutically effective amount of a compound according to formula (1), or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.
The present invention is farther directed to a method for the treatment of cancer and enhancing the activity of standard of care cancer agents, exemplified here for therapy of multiple myeloma, and for reducing resistance to Pls, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to formula (I), or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 provides data showing Proteasome Inhibitor re-sensitizing characteristics of compounds of the invention in resistant MM cells and various other cancer cell types.
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Figure 2 shows single agent anti-tumor potency of compounds of the invention in a panel of solid and hematological cancer cell lines.
Figure 3 provides data showing HDACi re-sensitizing characteristics of compounds of the invention in panels of solid and hematological cancer cell types.
Figure 4 shows inhibition of PDI activity by E64FC26 and E64FC29 as measured by insulin aggregation.
Figure 5 shows activity data of representative compounds of the invention.
DETAILED DESCRIPTION OF THE INVENTION
It is to be understood that the descriptions of the present invention have been simplified to illustrate elements that are relevant for a clear understanding of the present invention, while eliminating, for the purpose of clarity, many other elements found in typical pharmaceutical compositions. Those of ordinary skill in the art will recognize that other elements and/or steps are desirable and/or required in implementing the present invention. However, because such elements and steps are well known in the art, and because they do not facilitate a better understanding of the present invention, a discussion of such elements and steps is not provided herein. The disclosure herein is directed to all such variations and modifications to such elements and methods known to those skilled in the art. Furthermore, the embodiments identified and illustrated herein are for exemplary purposes only, and are not meant to be exclusive or limited in their description of the present invention..
The invention is directed to, for example, compounds that inhibit protein disulfide isomerase (PDI). The compounds of the invention demonstrate anti-tumor efficacy as single agents and enhance the activity of other targeted cancer therapeutics, including proteasome and HDAC inhibitors.
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The inventors identified PDI as a promising target in cancer, including treatment resistant cancer.
For example, the inventors identified compounds E64FC26:
Figure AU2018323528A1_D0002
H and E64FC65:
CF, / ·-
Figure AU2018323528A1_D0003
Technical and scientific terms used herein have the meaning commonly understood by one of skill in the art to which the present invention pertains, unless otherwise defined. Reference is made herein to various methodologies and materials known to those of skill in the art. Standard reference works setting forth the general principles of pharmacology include Goodman and Gilman's The Pharmacological Basis of Therapeutics, 10th Ed., McGraw Hill Companies Inc., New York ( 2()01). Any suitable materials and/or methods known to those of skill can be utilized in carrying out the present invention. However, preferred materials and methods are described. Materials, reagents and the like to which reference are made in the following description and examples are obtainable from commercial sources, unless otherwise noted.
A compound according to the invention is inherently intended to comprise all stereocbemically isomeric forms thereof. The term stereochemical ly isomeric forms as used hereinbefore or hereinafter defines all the possible stereoisomeric forms which the compounds of formula (I) and their N-oxides, pharmaceutically acceptable salts or physiologically functional derivatives may possess. Unless otherwise mentioned or indicated, the chemical designation of compounds
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PCT/US2018/048449 denotes the mixture of all possible stereochemically isomeric forms. In particular, stereogenic centers may have the R- or S-configuration; substituents on bivalent cyclic (partially) saturated radicals may have either the cis- or trans-eonfiguration. Compounds encompassing double bonds can have an E (entgegen) or Z (zusammen)-stereochemistty at said double bond. The terms cis, trans, R, S, E and Z are well known to a person skilled in the art.
Stereochemically isomeric forms of the compounds of formula (I) are obviously intended to be embraced within the scope of this invention. Of special interest are those compounds of formula (I) which are stereochemically pure.
Following C AS-nomenclature conventions, when two stereogenic centers of known absolute configuration are present in a molecule, an R or S descriptor is assigned (based on Cahn-IngoldPrelog sequence rule) to the lowest-numbered chiral center, the reference center. The configuration of the second stereogenic center is indicated using relative descriptors [R*,R*] or [R*,S*], where R* is always specified as the reference center and [R*,R*] indicates centers with the same chirality and [R*,S*] indicates centers of unlike chirality. For example, if the lowestnumbered chiral center in the molecule has an S configuration and the second center is R, the stereo descriptor would be specified as S—If “a and ”β are used: the position of the highest priority substituent on the asymmetric carbon atom in the ring system having the lowest ring number, is arbitrarily al ways in the a1’ position of the mean plane determined by the ring system. The position of the highest priority substituent on the other asymmetric carbon atom in the ring system relative to the position of the highest priority substituent on the reference atom is denominated a, if it is on the same side of the mean plane determined by the ring system, or β”, if it is on the other side of the mean plane determined by the ring system.
When a specific stereoisomeric form is indicated, this means that said form is substantially free, i.e. associated with less than 50%, preferably less than 20%, more preferably less than 10%, even more preferably less than 5%, further preferably less than 2% and most preferably less than 1 % of the other isomer(s). Thus, when a compound of formula (1) is for instance specified as (R,S), this means that the compound is substantially free of the (S,R) isomer.
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The compounds of formula (I) may be synthesized in the form of mixtures, in particular racemic mixtures, of enantiomers which can be separated from one another fol lowing art-known resolution, procedures. The racemic compounds of formula (I) maybe converted into the corresponding diastereomeric salt forms by reaction with a suitable chiral acid. Said diastereomeric salt forms are subsequently separated, for example, by selective or fractional crystallization and the enantiomers are liberated therefrom by alkali. An alternative manner of separating the enantiomeric forms of the compounds of formula (I) involves liquid chromatography using a chiral stationary phase. Said pure stereochemically isomeric forms may also be derived from the corresponding pure stereochemically isomeric forms of the appropriate starting materials, provided that the reaction occurs stereospecifically. Preferably if a specific stereoisomer is desired, said compound will be synthesized by stereospecific methods of preparation. These methods will advantageously employ enantiomerically pure starting materials.
The tautomeric forms of the compounds of formula (I) are meant to comprise those compounds of formula (I) wherein e.g. an enol group is con verted into a keto group (keto-enol tautomerism). Tautomeric forms of the compounds of formula (I) or of intermediates of the present invention are intended to be embraced bv the ambit of this invention.
The term “alkyl” as used herein denotes an unbranched or branched chain, saturated, monovalent hydrocarbon residue containing 1 to 20 carbon atoms. In one embodiment, the number of carbon atoms in the alkyl chain can be 2, 3,4, 5,6,7, 8,9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19or20 carbon atoms. In another embodiment, the number of carbon atoms in the alkyl chain can be from 5 to 16 and referred to as ”(C.5-C i6)alkyl.” The term “lower alkyl” denotes a straight or branched chain hydrocarbon residue containing 1 to 6 carbon atoms. alkyl as used herein refers to an alkyl composed of 1 to 20 carbons. Examples of alkyl groups include, but are not limited to, lower alkyl groups include methyl, ethyl, propyl, Z-propyl, /r-butyl, /-butyl, /-butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecycl and hexadecyl.
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The term alkenyl” as used herein denotes an unbranched or branched chain, saturated, monovalent hydrocarbon residue of from 2 to 24 carbon atoms with a structural formula containing at least one carbon-carbon double bond. In one embodiment, the number of carbon atoms in the alkenyl chain can be 2, 3,4, 5, 6, 7, 8,9, 10,11, 12, 13, 14,15,16, 17, 18,19 or 20 carbon atoms. In another embodiment, the number of carbon atoms in the alkenyl chain can be from 5 to 16 and referred to as ’’(Cs-C^) alkenyl.”
When the term “alkyl” is used as a suffix following another term, as in “phenylalkyl,” or “hydroxyalkyl ” this is intended to refer to an alkyl group, as defined above, being substituted with one to two substituents selected from the other specifically-named group. Thus, for example, “phenylalkyl” denotes the radical R'R.-, wherein R' is a phenyl radical, and R is an alkylene radical as defined herein with the understanding that the attachment point of the pheny lalkyl moiety will be on the alkylene radical. Examples of arylalkyl radicals include, but are not limited to, benzyl, phenylethyl, 3-phenylpropyl. The terms “arylalkyl” or ''aralkyl are interpreted similarly except R' is an aryl radical. The terms (het)arylalkylw or (het)aralkyl are interpreted similarly except R' is optionally an aryl or a heteroaryl radical.
The term alkoxy as used herein means an -O-alkyl group, wherein alkyl is as defined above such as methoxy, ethoxy, «-propyloxy, /-propyloxy, ra-butyloxy, ί-butyloxy, t-butyloxy, pentyloxy, hexyloxy, including their isomers. Lower alkoxy as used herein denotes an alkoxy group with a lower alkyl group as previously defined. ’'Ci-jo alkoxy as used herein refers to an-O-alkyl wherein alkyl is Cm».
The term “halogen” as used herein means fluorine, chlorine, bromine or iodine. In one embodiment, halogen may be fluorine or bromine.
A “patient” is a mammal, e.g., a human, mouse, rat, guinea pig, dog, cat, horse, cow, pig, or nonhuman primate, such as a monkey, chimpanzee, baboon or rhesus monkey, and the terms “patient” and “subject” are used interchangeably herein.
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The term “carrier”, as used in this disclosure, encompasses carriers, excipients, and diluents and means a material, composition or vehicle, such as a liquid or solid filler, diluent, excipient, solvent or encapsulating material, involved in carrying or transporting a pharmaceutical agent from one organ, or portion of the body, io another organ, or portion of the body.
The term “treating”, with regard to a subject, refers to improving at least one symptom of the subject’s disorder. Treating can be curing, improving, or at least partially ameliorating the disorder.
The term “disorder” is used in this disclosure to mean, and is used interchangeably with, the terms disease, condition, or illness, unless otherwise indicated.
The term “administer”, “administering”, or “administration” as used in this disclosure refers to either directly administering a compound or pharmaceutically acceptable salt of the compound or a composition to a subject, or administering a prodrug derivative or analog of the compound or pharmaceutically acceptable salt of the compound or composition to the subject, which can form an equivalent amount of active compound within the subject’s body.
The term “optionally substituted,” as used in this disclosure, means a suitable substituent can replace a hydrogen bound to a carbon, nitrogen, or oxygen. When a substituent is oxo (Z.e., - O) then 2 hydrogens on the atom are replaced by a single 0. In one embodiment, an alkyl or lower alkyl group can substituted with, for example, -Nj, -C=CH, phenyl or OH. It will be understood by those skilled in the art, with respect to any group containing one or more substituents, that such groups are not intended to introduce any substitution or substitution patterns that are sterically impractical, synthetically non-feasible and/or inherently unstable. Furthermore, combinations of substituents and/or variables within any of the Formulae represented herein are permissible only if such combinations result in stable compounds or useful synthetic intermediates wherein stable implies a reasonable pharmacologically relevant half-life at physiological conditions.
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Dosage and Administration:
The compounds of the present invention may be formulated in a wide variety of oral administration dosage forms and carriers. Oral administration can be in the form of tablets, coated tablets, dragees, hard and soft gelatin capsules, solutions, emulsions, syrups, or suspensions. Compounds of the present invention are efficacious when administered by other routes of administration including continuous (intravenous drip) topical parenteral, intramuscular, intravenous, subcutaneous, transdermal (which may include a penetration enhancement agent), buccal, nasal, inhalation and suppository administration, among other routes of administration. The preferred manner of administration is generally oral using a convenient daily dosing regimen which can be adjusted according to the degree of affliction and the patient’s response to the active ingredient.
A compound or compounds of the present invention, as well as their pharmaceutically useable salts, together with one or more conventional excipients, carriers, or diluents, maybe placed into the form of pharmaceutical compositions and unit dosages. The pharmaceutical compositions and unit dosage forms may be comprised of conventional ingredients in conventional proportions, with or without additional active compounds or principles, and the unit dosage forms may contain any suitable effective amount of the active ingredient commensurate with the intended daily dosage range to be employed. The pharmaceutical compositions maybe employed as solids, such as tablets or filled capsales, semisolids, powders, sustained release formulations, or liquids such as solutions, suspensions, emulsions, elixirs, or filled capsules for oral use; or in the form of suppositories for rectal or vaginal administration; or in the form of sterile injectable solutions for parenteral use. A typical preparation will contain from about 5% to about 95% active compound or compounds (w/w). The term preparation or dosage form is intended to include both solid and liquid formulations of the active compound and one skilled in the art will appreciate that an active ingredient can exist in different preparations depending on the target organ or tissue and on the desired dose and pharmacokinetic parameters.
The term “excipient” as used herein refers to a compound that is useful in preparing a pharmaceutical composition, generally safe, non-toxic and neither biologically nor otherwise
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PCT/US2018/048449 undesirable, and includes excipients that are acceptable for veterinary use as well as human pharmaceutical use. The compounds of this invention can be administered alone but will generally be administered in admixture with one or more suitable pharmaceutical excipients, diluents or carriers selected with regard to the intended route of administration and standard pharmaceutical practice.
“Pharmaceutically acceptable” means that which is usefol in preparing a phannaceuiical composition that is generally safe, non-toxic, and neither biologically nor otherwise undesirable and includes that which is acceptable for veterinary as well as human pharmaceutical use,
A '’pharmaceutically acceptable salt form of an active ingredient may also initially confer a desirable pharmacokinetic property on the active ingredient which were absent in the non-salt form, and may even positively affect the pharmacodynamics of the active ingredient with respect to its therapeutic activity in the body. The phrase “pharmaceutically acceptable salt” of a compound means a salt that is pharmaceutically acceptable and that possesses the desired pharmacological activity of the parent compound. Such salts include: (1) acid addition salts, formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like; or formed with organic acids such as acetic acid, propionic acid, hexanoic acid, cyclopentanepropionic acid, glycolic acid, pyruvic acid, lactic acid, malonic acid, succinic acid, malic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, 3~(4~hydroxybenzoyl)benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, 1,2-ethane-disulfonic acid, 2-hydroxyethane8ulfonic acid, benzenesulfonic acid, 4-chlorobenzenesulfonic acid, 2-naphthalenesulfonic acid, 4-toIuenesulfonic acid, camphorsulfonic acid, 4-methylbicyclo[2.2.2]-oct-2-ene-l -carboxylic acid, glucoheptonic acid, 3-phenylpropionic acid, trimethyl acetic acid, tertiary butylacetic acid, lauryl sulfone acid, gluconic acid, glutamic acid, hydroxynaphthoic acid, salicylic acid, stearic acid, muconic acid, and the like; or (2) salts formed when an acidic proton present in the parent compound either is replaced by a metal ion, e.g., an alkali metal ion, an alkaline earth ion, or an aluminum ion; or coordinates with an organic base such as ethanolamine, diethanolamine, triethanolamine, tromethamine, N-methylglucamine, and the like.
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Solid form preparations include powders, tablets, pills, capsules, cachets, suppositories, and dispersible granules. A solid carrier may be one or more substances which may also act as diluents, flavoring agents, solubilizers, lubricants, suspending agents, binders, preservatives, tablet disintegrating agents, or an encapsulating material. In powders, the carrier generally is a finely divided solid which is a mixture with the finely divided active component. In tablets, the active component generally is mixed with the carrier having the necessary binding capacity in suitable proportions and compacted in the shape and size desired. Suitable carriers include but are not limited to magnesium carbonate, magnesium stearate, talc, sugar, lactose, pectin, dextrin, starch, gelatin, tragacanth, methylcelluiose, sodium carboxymethylcellulose, a low melting wax, cocoa butter, and the like. Solid form preparations may contain, in addition to the active component, colorants, flavors, stabilizers, buffers, artificial and natural sweeteners, dispersants, thickeners, solubilizing agents, and the like.
Liquid formulations also are suitable for oral administration include liquid formulation including emulsions, syrups, elixirs, aqueous solutions, aqueous suspensions. These include solid form preparations which are intended to be converted to liquid form preparations shortly before use. Emulsions may be prepared in solutions, for example, in aqueous propylene glycol solutions or may contain emulsifying agents such as lecithin, sorbitan monooleate, or acacia. Aqueous solutions can be prepared by dissolving the active component in water and adding suitable colorants, flavors, stabilizing, and thickening agents. Aqueous suspensions can be prepared by dispersing the finely divided active component in water with viscous material, such as natural or synthetic gums, resins, methylcelluiose, sodium carboxymethylcellulose, and other well-known suspending agents.
The compounds of the present invention may be formulated lor parenteral administration (e.g., by injection, for example bolus injection or continuous .infusion) and may be presented in unit dose form in ampoules, pre-filled syringes, small volume infusion or in multi-dose containers with an added preservative. The compositions may take such forms as suspensions, solutions, or emulsions in oily or aqueous vehicles, for example solutions in aqueous polyethylene glycol. Examples of oily or nonaqueous carriers, diluents, sol vents or vehicles include propylene glycol.
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The compounds of the present invention may be formulated for topical administration to the epidermis as ointments, creams or lotions, or as a transdermal patch. Ointments and creams may, for example, be formulated with an aqueous or oily base with the addition of suitable thickening and/or gelling agents. Lotions may be formulated with an aqueous or oily base and will in general also containing one or more emulsifying agents, stabilizing agents, dispersing agents, suspending agents, thickening agents, or coloring agents. Formulations suitable for topical administration in the mouth include lozenges comprising active agents in a flavored base, usually sucrose and acacia or tragacanth; pastilles comprising the active ingredient in an inert base such as gelatin and glycerin or sucrose and acacia; and mouthwashes comprising the active ingredient in a suitable liquid carrier.
The compounds of the present invention may be formulated for administration as suppositories. A low melting wax, such as a mixture of fatty acid glycerides or cocoa butter is first melted and the active component is dispersed homogeneously, for example, by stirring. The molten homogeneous mixture is then poured into convenient sized molds, allowed to cool, and to solidify.
The compounds of the present invention may be formulated for vaginal administration. Pessaries, tampons, creams, gels, pastes, foams or sprays containing in addition to the active ingredient such earners as are known in the art to be appropriate.
I'he compounds of the present in vention may be formulated for nasal administration. The solutions or suspensions are applied directly to the nasal cavity by conventional means, for example, with a dropper, pipette or spray. The formulations may be provided in a single or multidose form. In the latter case of a dropper or pipette, this may be achieved by the patient
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The compounds of the present invention may be formulated for aerosol administration, particularly to the respiratory tract and including intranasal administration. The compound will generally have a small particle size for example of the order of five (5) microns or less. Such a particle size may be obtained by means known in the art, for example by micronization. The active ingredient is provided in a pressurized pack with a suitable propellant such as a chlorofluorocarbon (CFC), for example, dichlorodifluoromethane, trichlorofluoromethane, or dichlorotetrafluoroethane, or carbon dioxide or other suitable gas. The aerosol may conveniently also contain a surfactant such as lecithin. The dose of drug may be controlled by a metered valve. Alternatively the active ingredients may be provided in a form of a dry powder, for example a powder mix of the compound hi a suitable powder base such as lactose, starch, starch derivatives such as hydroxypropylmethyl cellulose and polyvinylpyrrolidine (PVP). The powder carrier will form a gel in the nasal cavity. The powder composition may be presented in unit dose form for example in capsules or cartridges of e.g., gelatin or blister packs from which the powder may be administered by means of an inhaler.
When desired, formulations can be prepared with enteric coatings adapted for sustained or controlled release administration of the active ingredient. For example, the compounds of the present invention can be formulated in transdermal or subcutaneous drug delivery devices. These delivery systems are advantageous when sustained release of the compound is necessary and when patient compliance with a treatment regimen is crucial . Compounds in transdermal delivery systems are frequently attached to a skin-adhesive solid support. The compound, of interest can also be combined with a penetration enhancer, e.g.. Azone (1 -dodecylazacycloheptan-2-one). Sustained release delivery systems are inserted subcutaneously into to the subdermal layer by surgery or injection. The subdermal implants encapsulate the compound in a lipid soluble membrane, e.g., silicone rubber, or a biodegradable polymer, e.g., polylactic acid.
Suitable formulations along with pharmaceutical carriers, diluents and excipients are described in Remington: The Science and Practice ofPharmacy 1995, edited by E. W. Martin, Mack.
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Publishing Company, 19th edition, Easton, Pennsylvania. A skilled formulation scientist may modify the formulations within the teachings of the specification to provide numerous formulations for a particular route of administration withou t rendering the compositions of the present invention unstable or compromising their therapeutic activity.
The modification of the present compounds to render them more soluble in water or other vehicle, for example, may be easily accomplished by minor modifications (salt formulation, esterification, etc.), which are well within the ordinary skill in the art. It is also well within the ordinary skill of the art to modify the route of administration and dosage regimen of a particular compound in order to manage the pharmacokinetics of the present compounds for maximum beneficial effect in patients.
The term '‘therapeutically effective amount*’ as used herein means an amount required to reduce symptoms of the disease in an Individual. The dose will be adjusted to the Individual requirements in each particular case. That dosage can vary within wide limits depending upon numerous factors such as the severity of the disease to be treated, the age and general health condition of the patient, other medicaments with which the patient is being treated, the route and form of administration and the preferences and experience of the medical practitioner involved. For oral admin istra tion, a daily dosage of between about 0.01 and about 1000 mg/kg body weight per day should be appropriate in monotherapy and/or in combination therapy. A preferred, daily dosage is between about 0,1 and about 500 mg/kg body weight, more preferred 0.1 and about 100 mg/kg body weight, and most preferred 1.0 and about 15 mg/kg body weight per day. Thus, for administration to a 70 kg person, the dosage range in one embodiment would be about 70 mg to .7 g per day. The daily dosage can be administered as a single dosage or in divided dosages, typically between 1 and 5 dosages per day. Generally, treatment is initiated with smaller dosages which are less than the optimum dose of the compound. Thereafter, the dosage is increased by small increments until the optimum effect for the individual patient is reached. One of ordinary skill in treating diseases described herein will be able, without undue experimentation and in reliance on personal knowledge, experience and the disclosures of this
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The pharmaceutical preparations are preferably in unit dosage forms. In. such form, the preparation is subdivided into unit doses containing appropriate quantities of the active component. The unit dosage form can be a packaged preparation, the package containing discrete quantities of preparation, such as picketed tablets, capsules, and powders in vials or ampoules. Also, the unit dosage form can be a capsule, tablet, cachet, or lozenge itself or it can be the appropriate number of any of these in packaged form.
Compounds of the present invention can be prepared beginning with commercially available starting materials and utilizing general synthetic techniques and procedures known to those skilled in the art. Chemicals may be purchased from companies such as for example SigmaAldrich, Argonaut Technologies, VWR and Lancaster. Chromatography supplies and equipment may be purchased from such companies as for example AnaLogix, Inc, Burlington, Wis.; Biotage AB, Charlottesville, Va.; Analytical Sales and Services, Inc., Pompton Plains, NJ.; Teledyne Isco, Lincoln, Nebr.; VWR International, Bridgeport, NJ.; and Waters Corporation, Milford, MA. Biotage, ISCO and Analogix columns are pre-packed silica gel columns used in standard chromatography.
EXAMPLES
The following examples further describe and demonstrate particular embodiments within the scope of the present invention. Techniques and formulations generally are found in Remington's Pharmaceutical Sciences (Mack Publishing Co., Easton, Pa.). The disclosure is further illustrated by the following examples, which are not to be construed as limiting this disclosure in scope or spirit to the specific procedures herein described. It is to be understood that the examples are provided to illustrate certain embodiments and that no limitation to the scope of the disclosure is intended thereby. It is to be further understood that resort may be had to various other embodiments, modifications, and equivalents thereof which may suggest themselves to
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Examplel
Synthesis Protocol of E64FC26
Figure AU2018323528A1_D0004
Figure AU2018323528A1_D0005
FC-7347
Figure AU2018323528A1_D0006
FC-7362
Step 1: l,l,l-Trifluoro-2-hydroxy-2-(3,4-dimethoxyphenyt)tridecan-4-one (1). A solution of undecan.-2-one (306 mg, 1.8 mmol) in THF (8 mL) was cooled to -78 °C , then LDA (2M solution in THF, 1.05 mL, 2.1 mmol) was added slowly. The mixture was stirred at -78 °C for 45 mins. A solution of 2,2,2-triiluoro-1-(3,4-dimethoxyphenyl)ethanone (234 mg, 1.0 mmol) in THF (2 mL) was added slowly. After stirred at -78 °C for 4 hrs, the mixture was warmed to RT for 30 mlns. 20 mL of Sat’d aq. NH4C1 was added. This mixture was extracted with diethyl ether (30 mL) twice. The combined ether layer was washed with brine (20 mL), dried over Na^SCfi and concentrated under vacuum. The residue was purified by ISCO flash column (0-—10% ethyl acetate/hexanes to afford title compound 404 mg (100%). LC/MS: Rf - 6.88 min, purity> 95%, (M+Hf - 404.68. lH NMR (300 MHz, CDCff) 8 7.13-7.22 (m, 1H), 6.91-7.05 (m, 1H), 6.83 (d, 7=8.50 Hz, 1H), 3.85 (s, 3H), 3.86 (s, 3H), 3.05-3.36 (m, 2H), 2,28-2.58 (m, 2H), 1.40-1.61 (m, 2H), 1.22 (br. s„ 1211). 0.86 (t, 7=6.45 Hz, 3H)
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Step 2: (Z)-3-(Trifluoromethyl)-5,6-dimethoxy-l-nonyIidene-lH-indeiie (2) and (£4-3(triflu0romethyl)-5,6-diniethoxy-l-nonylidene-lIl-iiidene (3) The mixture of 1 (202 mg, 0.5 mmol), TsOH (48 mg, 0.25 mmol) in toluene (3 mL) was heated at 100 l’C for 5 hrs. After reaction was done, the mixture was concentrated. The residue was purified by ISCO eluting with 0—10% ethyl acetate/ hexanes to give the isomers (2: 34 mg; 3: 138 mg). LC/MS: Rc = 8.42 min, purity> 95%, (M+HV = 369.66. NMR (300 MHz, CDCI3) § 7.29-7.40 (m, 1H), 6.967.04 (m, 1H), 6.72 (s, 1H), 6.41-6.60 (m, 1H), 3.92-4.03 (m, 611). 2.73-2.92 (m, 2H), 1.58-1.81 (m, 2H), 1.24-1.56 (m, 10H), 0.77-1.02 (m, 3H); Rn = 8.27 min, purity> 95%, (Μ+ΗΓ = 369.66. lH NMR (300 MHz, CDCI3) δ 7.14-7.26 (m, 1H), 7.07 (br. s., 1H), 6.98 (s, 1H), 6.81 (t, >7.91 Hz, 1H), 3.93-4.05 (m, 6H), 2.60 (q, >7.42 Hz, 2H), 1.51-1.72 (m, 2H), 1.20-1.50 (m, 10H), 0.76-1.07 (m, 3H)
Step 3-1: (Z)“3-('rriilu0romethyl)“l-nonylidene-1H-indene-5,6“dioI (FC-7947). To a solution of in 2 (41 mg, 0.11 mmol) in CH2CI2 (1 mL) was added 0.33 mL IM BBn solution in CH2C12 at -78C and stayed at -78 C for 1 hr. The mixture was then warmed up to -20 °C for 1.5 hrs. TLC indicated the reaction was done. 4 mL NH4C1 and 5.0 mL ether were added. The organic layer was separated, dried, concentrated. The residue was purified to give FC-7947 (25 mg, 67% yield). LC/MS: Rf === 6.93 min. purity >95%, (M+Hf:::: 341.64. 1H NMR (300 MHz, CDCI3) δ 7.32-7.50 (tn, 1H), 6.94-7.13 (m, 1H), 6.61-6.81 (m, 1H), 6,38-6,60 (m, 1H), 5.25-5.68 (m, 2H), 2.54-2.85 (m, 2H), 1.56-1.79 (m, 2H), 1.17-1.52 (m, 10H), 0.76-1.04 (m, 3H)
Step 3-2: (£)-3-(Trifiuor0ineihyl)-l~nonyLidene-1 H-indene-5,6-diol (FC-7362). To a solution of 3 (158 mg, 0.43 mmol) in CH2C12 (5 mL) was added 1.3 mL IM BBn solution in CH2CI2 at 78°C and stirred at -78 °C for Ihr. The mixture was then warmed up to -20 °C for 1.5 hrs. TLC indicated the reaction was done. 15 mL NH4CI and 30 mL ether were added. The organic layer was separated, dried, concentrated. The residue was purified by ISCO to give FC-7947 (96 mg, 65% yield). LC/MS: Rf- 6.93 min, purity >95%, (M+Hf = 341.64. SH NMR (300 MHz,
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CDCfi) δ 7.10-7.23 (m, 1H), 7.00-7.09 (m, 1H), 6.98 (d, >1.17 Hz, 1H), 6.62-6.77 (m, 1H),
2.46-2.65 (m, 2H), 1.46-1.68 (in, 2H), 1.20-1.45 (m, 10H), 0.79-1.02 (rn, 3H).
Example 2
Synthesis Protocol of E64FC65
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w,-7soc
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Figure AU2018323528A1_D0009
Figure AU2018323528A1_D0010
FC4377
FC-6975 E64FC65
Step 1: 2-(benzo[d| Jl,3|dioxoI-6-y1)-l,l,l-Mfluoro-2-hydroxyundecan-4-one (4). A solution of nonan-2-one (983 mg, 6.9 mmol) in THF (50 mL) was cooled to -78 !fC, and then LDA (2M solution in THF, 4,0 mL, 7.8 mmol) was added slowly. The mixture was stirred at -78 °C for 45 mlns, A solution of 1 -(benzo[d][l,3]dioxol-6-yi)-2,2,2-trifluojO ethanone (1.0 g, 4.6 mmol) in THF (5 mL) was added slowly. After stirred at -78 °C for 4 hrs, the mixture was warmed to RT for 30 mlns. 100 mL of Sat’d aq. NH4CI was added. This mixture was extracted with diethyl ether (100 mL) twice. The combined ether layer was washed with brine (50 mL), dried over NaaSOi and concentrated under vacuum. The residue was purified by 1SCO flash column (0— 10% ethyl acetate/hexanes to afford title compound 1.62 g (98%). LC/MS: Rf = 6.70 min, purity> 95%, (M)+ - 360.61.
Step 2: (5Z)-7-(tnfluoromethyl)-5“h^tyIidene“5H-indeno[5,6-dyi,,3Idtoxole (FC-9377) and (5E)-7-(trifluoromethyl)-5-heptylidene-5H-lndeno[5,6-d][l,3]dioxole (FC-8975, E64FC65)
The mixture of 4 (1.62 g, 4.5 mmol), TsOFI (387 mg, 2.25 mmol) in toluene (25 mL) was heated at 125 °C for 1.5 hrs. After reaction was done, the mixture was concentrated. The residue was purified by ISCO eluting with 0—10% ethyl acetate/ hexanes to give the mixture (557 mg). This mixture was further purified by Gilson (75—100% MeCN/H2O) to give the title compounds (FC-8975, 288 mg) and (FC-9377,14 mg). LC/MS: Rfl - 7.86 min, purity> 95%, (M+Hji' -18WO 2019/046368
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325.59. fH NMR (300 MHz, CDC13) 5 7.04-7.14 (m, 2H), 7.01-7.07 (m, 1H), 6.86-6.99 (m, 1H), 6.65-6.82 (m, 1H), 5.99 (s, 2H), 2.46-2.68 (m, 2H)S 1.47-1.70 (m, 2H), 1.17-1.46 (m, 7H), 0.790.99 (m, 3H)
RK - 7.94 min, purity> 95%, (M)* - 324.64. !H NMR (300 MHz, CDCI3) δ 7.09 (s, 1H), 6.94 (s, 1H), 6.68-6.69 (m, 1H), 6.49 (t, >7.32 Hz, 1H). 6.00 (s, 2H), 2.70 (q, 2H), 1.59-1.66 (m, 2H). 1.30-1.35 (m, 6H), 0.87-0.92 (m, 3H)
Example 3
Synthesis Protocol of Additional Compounds of the Invention
Using the procedures in Examples 1 and 2 above, the following compounds were also be prepared·
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Figure AU2018323528A1_D0011
Figure AU2018323528A1_D0012
Figure AU2018323528A1_D0013
Figure AU2018323528A1_D0014
Figure AU2018323528A1_D0015
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Figure AU2018323528A1_D0016
Figure AU2018323528A1_D0017
E64FC59
E64FC61
E64FC8.2 \ E64FCS
E64FC6Q
Figure AU2018323528A1_D0018
E64FC64
E64FCS6
E64FCS7
E64FCS9
E64FC68
F64FC70
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Figure AU2018323528A1_D0019
Figure AU2018323528A1_D0020
E64FC79
Figure AU2018323528A1_D0021
E64FC75
Figure AU2018323528A1_D0022
Figure AU2018323528A1_D0023
Figure AU2018323528A1_D0024
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Figure AU2018323528A1_D0025
Figure AU2018323528A1_D0026
Figure AU2018323528A1_D0027
Figure AU2018323528A1_D0028
Figure AU2018323528A1_D0029
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Example 4
Biological Assays
Proteasome Inhibitor sensitizing characteristics of representative compounds of the invention
Reference is made to Figure 1. (A) The structures of novel derivatives E64FC26 and E64FC65 are shown. (B) Proteasome inhibitor (PI) resistant MM.IS BzR cells were treated with the E64FC26 at a concentration of 500 nM and a dose range of the PI bortezomib (Btz). Cell viability was measured after 24 hours of treatment. The calculated Btz EC50 for control cells treated with the DMSO vehicle was 45.5 nM compared to and EC50 of 4.7 nM In cells co-treated with E64FC26, a 9.7-fold increase in Btz sensitivity. (C) PANC-1 pancreatic cancer cells were treated with the indicated derivative at a final concentration of 1 μΜ and a dose range of Btz. Cell viability was measured after a 48 hour treatment time. The Btz EC50 in the presence of DMSO vehicle control was 83.5 nM compared to 9.1 nM in the presence of E64FC26 and 1.8 nM in the presence of E64FC65, corresponding to a 9.2-fold, and 46.4-foid increase in Btz sensitivity, respectively. (D) Panels of pancreatic, ovarian, glioma, multiple myeloma, and normal cells were treated with E64FC26 and a dose range of the second generation proteasome inhibitor carfilzomib (Crflz) using a protocol similar to that described above for panels (B) and (C). Crflz EC50 values were extrapolated from dose curves conducted in the presence and absence of E64FC26 and a fold-change was calculated. Each data point represents the foldchange, or the degree of Crflz potentiation, for each cell line tested..
Broad spectrum single agent anti-tumor efficacy of representative compounds of the invention
Reference is made to Figure 2. Cell lines originating from the indicated tumor types were treated with 1 μΜ E64FC26. After 48 hours of treatment ceil viability was measured. Data represent the % viable cells relative to DMSO treated control cell cultures.
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HDAC Inhibitor sensitizing characteristics of rep resentatiy e compo u nds of the invention
Reference is made to Figure 3. (A) In PANC-1 pancreatic cancer cells, the cytotoxicity of each of the indicated HDAC inhibitors was evaluated in the presence and absence of I μΜ E64FC26. EC50 values are shown. (B) Similar experiments as described in (A) were conducted using T98G glioblastoma cells. EC50 values for each of the HDAC inhibitor in the presence and absence of 1 μΜ E64FC26. (C) Panels of the indicated tumor cel! types were treated with a dose range of the HDAC inhibitor panobinostat in the presence and absence of 1 μΜ E64FC26. EC50 values were extrapolated and the relative effect of E64FC26 on panobinostat sensitivity was calculated. Each data point indicated the fold change in panobinostat EC50 for that particular cell line. (D) An example of foil panobinostat dose response curves in PANC-1 pancreatic cancer cells are shown. PANC-1 cells were co-ireated with DMSO vehicle control, 1 μΜ E64FC26, or I μΜ E64FC65. The panobinostat EC50 in DMSO treated cells was 453 nM compared to 5.3 nM in the presence of E64FC26 and 1.1 nM in the presence of E64FC65, an increase in panobinostat sensitivity of 85.5-fold and 412-fold, respectively.
In viva anti-ΜΜ activity of E64 FC26
Reference is made to Figure 4. The weekly dosing schedules for E64FC26 (2 mg/kg, i,p.) and Btz (0.25 mg/kg, i.p.) are shown. (B) NSG mice were injected i.v. with 1 x 106parental MM.IS cells. After 7 days, mice were randomized into groups (N=8-9) that received treatment with vehicle, E64FC26, Biz, or the combination of E64FC26/Btz using the dosing regimen outlined in Survival data are shown.
Inhibition of PDl activity by representative compounds of the invention in vitro
Reference is made to the data table in Figure 5. The table provides the following data for each of the indicated derivatives:
1. EC50 values in cytotoxicity assays in proteasome inhibitor resistant MM cells (MM.IS BzR) as a single agent [column labeled (-) Btz|.
2. EC50 values in cytotoxicity assays in proteasome inhibitor resistant MM cells (MM. IS BzR) in combination with 20 nM Btz [column labeled (+-) 20 nM Btz].
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3. PDI inhibition IC50 in in vitro PDI assays. PDI biochemical assays were performed by incubating 1 μΜ of recombinant purified PDI for I hour at 37 degrees Celsius. 100 μΜ human insulin and 1 m'M DTT were added to initiate the PDI catalyzed aggregation of insulin. The absorbance changes at 650 nm were followed over 45 minutes with measurements taken every minute. The absorbance values in the exponential range were taken and normalized to PDI activity in the absence of inhibitor.
The invention is further described in the following numbered paragraphs:
1. A compound of formula (I):
Figure AU2018323528A1_D0030
wherein:
R : and R;·. independently of each other, are hydrogen, hydroxyl, alkyl, alkoxy, methoxy-acetate, phosphate, valine, Gly-Ser, -OC(O)CH2OC(O)CH3, -OCCOjCH^OCHj, -OCH2C(OKj(CH3)3, OCH2C(O)NH2 or OCH2C(O.XJH; or R} and R2, together with the carbon atoms to which they are attached, form a 5 to 6-membered ring with one or two ring carbons replaced independently by oxygen or nitrogen;
R3 is hydrogen, hydroxyl, halogen, cyano, -COOH, -C(O)NH2, -C(O)CH2CH3, -C(O)-alkoxy, alkyl, alkoxy, halo-lower alkyl, carboxyl, amide, ester or nitrile; and
-26WO 2019/046368
PCT/US2018/048449
R.4 is alkyl or alkenyl, said alkyl or alkenyl optionally mono or bl-substituted independently with hydrogen, halogen, hydroxyl, -OCHj-phenyl, cycloalkyl, -OCH2-halophenyl or OCH2phenylhaloalkyl, or a pharmaceutically acceptable salt thereof.
2. The compound according to paragraph 1, wherein R t and R2, independently of each other, are hydrogen, hydroxyl, alkyl, alkoxy, methoxy-acetate, phosphate, valine, Gly-Ser, -
OC(O)CH2OC(O)CH3, -OC(O)CH2OCH3, ~OCH2C(O)C(CH3)3, -OCH2C(O)NH2 or OCH2C(O)OH, . The compound according to paragraph 1, wherein Rt and R2, together with the carbon atoms to which they are attached, form a 5 to 6-membered ring with one or two ring carbons replaced independently by oxygen or nitrogen.
4. The compound according to paragraph 1, wherein Rj is hydroxyl.
5. The compound according to paragraph I, wherein R2 is hydroxyl.
6. The compound according to paragraph 1, wherein both Rj and R2 are hydroxyl.
7. The compound according to paragraph I, wherein Rj is alkoxy.
8. The compound according to paragraph 1, wherein R2 is alkoxy.
9. The compound according to paragraph I, wherein both Rt and R.· are alkoxy.
10. The compound according to paragraph 1, wherein R3 is hydrogen, hydroxyl, halogen, cyano, -COOH, -C(O)NH2, -C(O)CH2CH3, -C(())-alkoxy, alkyl, alkoxy, halo-lower alkyl, carboxyl, amide, ester or nitrile.
11. The compound according to paragraph I, wherein R3 is amide.
12. The compound according to paragraph 1, wherein R? is -CF3.
WO 2019/046368
PCT/US2018/048449
13. The compound according to paragraph I, wherein R4 is alkenyl.
14. The compound according to paragraph 1, wherein is alkenyl optionally mono or bisubstituted independently with hydrogen, halogen, hydroxyl, -OCHa-phenyl, cycloalkyl, -OCFThalophenyI or OC Hj-phenylhaloalkyI.
15. A compound, wherein said compound is:
-28WO 2019/046368
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Figure AU2018323528A1_D0031
- 29 WO 2019/046368
PCT/US2018/048449
Figure AU2018323528A1_D0032
Figure AU2018323528A1_D0033
WO 2019/046368
PCT/US2018/048449
Figure AU2018323528A1_D0034
Figure AU2018323528A1_D0035
-31 WO 2019/046368
PCT/US2018/048449
Figure AU2018323528A1_D0036
Figure AU2018323528A1_D0037
or a pharmaceutically acceptable salt thereof.
WO 2019/046368
PCT/US2018/048449
16. A pharmaceutical composition, comprising a therapeutically effective amount of a compound according to paragraph 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
17. A method for the treatment of cancer, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to paragraph 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
18. A method for the treatment of multiple myeloma, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to paragraph 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
19. A method for enhancing the activity of proteasome and/or HDAC inhibitors, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to paragraph 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
20, A method for enhancing the activity of proteasome and/or HDAC inhibitors during treatment of multiple myeloma, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to paragraph 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
21. A pharmaceutical composition, comprising a therapeutically effective amount of a compound according to paragraph 15, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
22. A method for the treatment of cancer, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to paragraph 15, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
- 33 WO 2019/046368
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23. A method for the treatment of multiple myeloma, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to paragraph .15, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
24. A method for enhancing the activity of proteasome and/or HD AC inhibitors, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to paragraph 15, or a phannaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
25, A method for enhancing the activity of proteasome and/or HDAC inhibitors during treatment of multiple myeloma, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to paragraph 15, or a pharmaceutically acceptable salt thereof, and a phannaceutically acceptable canier.
& Sf
It is to be understood that the invention is not limited to the particular embodiments of the invention described above, as variations of the particular embodiments may be made and still fall within the scope of the appended claims.

Claims (25)

  1. CLAIMS:
    1. A compound of formula (I):
    Figure AU2018323528A1_C0001
    (I), wherein:
    Ri and R2, independently of each other, are hydrogen, hydroxyl, alkyl, alkoxy, methoxy-acetate, phosphate, valine, Gly-Ser, -OC(O)CH2OC(O)CH3, -OC(O)CH2OCH3, -OCH2C(OXj(CH3)3» OCHjCCOjNHj or -OCH2C(OX)H; or Rj and R2, together with the carbon atoms to which they are attached, form a 5 to 6-membered ring with one or two ring carbons replaced independently by oxygen or nitrogen;
    R3 is hydrogen, hydroxyl, halogen, cyano, -COOH, -C(O)NH2, -C(O)CH2CH3, ~C(O)-alkoxy, alkyl, alkoxy, halo-lower alkyl, carboxyl, amide, ester or nitrile; and
    R,( is alkyl or alkenyl, said alkyl or alkenyl optionally mono or bi~substituted independently with hydrogen, halogen, hydroxyl, -OCH?-phenyl, cycloalkyl, -OCH2-halophenyl or -OCH2phenylhaloalky I, or a pharmaceutically acceptable salt thereof.
  2. 2. The compound according to claim I, wherein R3 and R?, independently of each other, are hydrogen, hydroxyl, alkyl, alkoxy, methoxy-acetate, phosphate, valine, Gly-Ser, OC(O)CH2OC(O)CHj, -OC(O)CH2OCH3, -OCH2C(O)C(CH3)3, -OCH2C(O)NH2 or OCH2C(O)OH.
    -35 WO 2019/046368
    PCT/US2018/048449
  3. 3. The compound according to claim 1, wherein Rj and Rj, together with the carbon atoms to which they are attached, form a 5 to 6-membered ring with one or two ring carbons replaced independently by oxygen or nitrogen.
  4. 4. The compound according to claim 1, wherein Riis hydroxyl.
  5. 5. The compound according to claim I, wherein R> is hydroxyl.
  6. 6. The compound according to claim 1, wherein both Rj and R- are hydroxyl.
  7. 7. The compound according to claim 1, wherein Rj is alkoxy.
  8. 8. The compound according to claim 1, wherein R2 is alkoxy.
  9. 9. The compound according to claim I, wherein both R{ and Rj are alkoxy.
  10. 10. The compound according to claim 1, wherein R3 is hydrogen, hydroxyl , halogen, cyano, COOH, -C(O)NH2, -C(O)CFI?CH3, -C(O)-alkoxy, alkyl, alkoxy, halo-lower alkyl, carboxyl, amide, ester or nitrile.
  11. 11. The compound according to claim 1, wherein R3 is amide.
  12. 12. The compound according to claim 1, wherein R3 is -CF3.
  13. 13. The compound according to claim 1, wherein R?, is alkenyl.
  14. 14. The compound according to claim 1, wherein R4 is alkenyl optionally mono or bi- substituted independently with hydrogen, halogen, hydroxyl, -OCHs-phenyl, cycloalkyl, -OCH>halophenyl or -OCI-h-phenylhaloalkyl.
  15. 15. A compound, wherein said compound is:
    - 36 WO 2019/046368
    PCT/US2018/048449
    Figure AU2018323528A1_C0002
    Figure AU2018323528A1_C0003
    -37WO 2019/046368
    PCT/US2018/048449
    Figure AU2018323528A1_C0004
    -38WO 2019/046368
    PCT/US2018/048449
    Figure AU2018323528A1_C0005
    Figure AU2018323528A1_C0006
    - 39 WO 2019/046368
    PCT/US2018/048449
    Figure AU2018323528A1_C0007
    Figure AU2018323528A1_C0008
    or a pharmaceutically acceptable salt thereof.
    -40WO 2019/046368
    PCT/US2018/048449
  16. 16. A pharmaceutical composition, comprising a therapeutically effective amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.
  17. 17. A method for the treatment of cancer, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
  18. 18. A method for the treatment of multiple myeloma, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to claim 1, or a phannaceuticaHy acceptable salt thereof and a pharmaceutically acceptable carrier.
  19. 19. A method for enhancing the activity of proteasome and/or HDAC inhibitors, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
  20. 20, A method for enhancing the activity of proteasome and/or HDAC inhibitors during treatment of multiple myeloma, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof and a phannaceuticaHy acceptable carrier.
  21. 21. A pharmaceutical composition, comprising a therapeutically effective amount of a compound according to claim 15, or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.
  22. 22. A method for the treatment of cancer, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to claim 15, or a pharmaceutically acceptable salt thereof, and a phannaceuticaHy acceptable carrier.
    -41 WO 2019/046368
    PCT/US2018/048449
  23. 23. A method for the treatment of .multiple myeloma, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to claim 15. or a phannaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
  24. 24. A method for enhancing the activity of proteasome and/or HD AC inhibitors, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to claim 15, or a phannaceutically acceptable salt thereof, and a phannaceutically acceptable carrier.
  25. 25. A method for enhancing the activity of proteasome and/or HDAC inhibitors during treatment of multiple myeloma, comprising the step of administering to a patient in need thereof a therapeutically effective amount of a compound according to claim 15, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
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